loop

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  1. N

    earth fault loop impedance calculation

    hello all could anyone help me i am doing my 2392 and i am a little stuck i have been asked a question which is using the following measured value of loop impedance 0.5 (40amp bs en 60898 type b mcb) ferfering to the maxium tabulated value given 1.15 show by calculation if the measured value is...
    • nathanm1982
    • Thread
    • calculation earth earth fault loop impedance fault impedance loop loop impedance
    • Replies: 3
    • Forum: UK Electrical Forum
  2. Greg84

    Metrel MI2120 rcd line loop tester

    Have just come across my metrel mi2120 tester totally unused from new as has other instruments open to offers if any use to anyone
  3. T

    Potential earth loop impedance issues for second floor flat

    Hello! After years of renting I'm currently in the process of purchasing our first property. We've had an offer accepted on a 1 bedroom flat in Surrey. However there are questions over the electrics, and knowing little about electrical wiring I'm a bit stumped on how bad the electrics are and...
    • TeeCK
    • Thread
    • earth floor impedance issues loop loop impedance potential second
    • Replies: 27
    • Forum: UK Electrical Forum
  4. Zdb

    Adiabatic equation infinite loop

    So I'm looking into the thermal constraints of every cable in my 2396 project. I've used the adiabatic equation in a spread sheet and 99% of them are fine with the CPC I have selected. However, there are a few really short circuits with very low earth fault loop impedance. Because of this the...
  5. Gary Tollison

    Earth fault loop impedance - textbook values vs BS7671

    Hello. I'm in the final stages of completing my electrician course, and I find myself confused (again) by EFLI. In the textbook provided is this: Uo 230V see below for each circuit. Calculate the maximum Zs for each circuit: Complete the table. The answers given in the textbook are said to...
  6. Just4MeDad

    For Sale - Megger LTW 325 Loop Tester (2 wire)

    Excellent condition, full working order, manuals etc. Located Chippenham, Wiltshire, will post. Offers around £225. :)
  7. T

    I can now do a junction "box" mf in 20 secs, switch loop and feed

    So, although as you know, I am not a tool tart I have invested in this little time saver. As you can see from the piccy you have two splitters and two switch JB and stripper (up to 2.5mm² T&E) but the jb only take 1mm/1.5mm². This is a wise investment not just a tool for a week and then gets...
  8. C

    Loop at switch - 2 gang switch

    Hi All, I am new to the site and have recently started doing more and more electrical work in my house, nothing too major, changing face plates, light fittings etc, however I have encountered an issue that I cannot sort out. I have a 2 gang light switch where it is looped in the switch. Nothing...
  9. Rocboni

    Closed loop Sensor monitoring

    Hello, How are closed loop sensors like the below and monitored integrated into a control system, isolation switches/switch amplifiers? These are typically used on explosion panels where when they blow off it snaps the cable or ceramic plate causing an open circuit. (I’m Prepared for the...
  10. M

    Low voltage Leds for serial loop.

    Hi folks. I'm guessing this forum is for larger electrical applications than this, and if anyone can point me to a more relevant site please do. But I thought I'd give you guys a punt. I have a need to put 5 leds in a 1:10 remote controlled vehicle. There isn't room (without it looking...
  11. cliffed

    Refurb works In offices

    Just your thoughts on this one,doing a part refurb on existing offices,no initial verification or certs found anywhere. Premises rewired bout 1990,adding sockets here & there in each room. The DB is a Crabtree Tpn polestar,just finished some loop readings ,& not good,1.49 the highest,there is...
  12. Midwest

    Loop Impedance Testing - Strange fault code

    Being doing a domestic bathroom refurb', lighting, altering shower circuit (have a Megger 1730 MFT). History, property has no RCD protection, but as it was a Hager CU, had contemplating using RCBO's (TN-C-S supply). Before doing any work, I decided to clamp the meter tails, as the property has...
  13. soms

    Earth loop impedance measurement affected by dimmer switch

    Working on a job today which included a very simple new lighting circuit. The lighting circuit a very short run from a distribution board to a single switch position, which then supplies a single luminaire. The customer wanted a dimmer switch to control the fitting. To crack on and perform the...
    • soms
    • Thread
    • dimmer dimmer switch earth impedance loop loop impedance measurement switch
    • Replies: 8
    • Forum: UK Electrical Forum
  14. Gary Tollison

    loop impedance, temperature, cable factor....

    Hello I'm not sure if this is the correct forum area to post this in, apologies if it isn't... I've been working through some mock questions on-line, and found myself confused by this: The measured value of loop impedance for a circuit is 0.83ohm. If the temperature at the time of the test was...
  15. Gavin John Hyde

    External earth loop Ze with switched fuse before CU

    Got a job where im having to do the usual testing. I have never tested a set up where due to the tails needing to being so long to reach the consumer unit there has been a switched fuse, this is i believe a standard directive from the DNO the tails then terminate into swa and run from the...
  16. S

    TT Ze reading- loop high or loop no trip?

    When measuring Ze on a TT that's RCD protected which is more accurate? Getting 27.1 on high current but 563 on no trip.
  17. Gary Tollison

    earth fault loop impedance

    Hello :) I'm confused about EFLI which I am guessing should be relatively straight-forward. I can't get my tired brain to figure out how to calculate the value for EFLI on system-side circuits? eg: what should the actual calculated value be for a 40A circuit, and how do I get that figure...
  18. Pete999

    Pete's Videos Earth loop impedance whats that then?

  19. N

    Earth loop meter required

    Can someone help me find a particular type of earth loop meter that I used to use years ago. It was the type that had a earth wander lead and probe. You plug in the meter to a socket, then touch the probe to the casing of the fixed appliance, you get an ELI reading I'm no longer a part P...
    • Nigel Cutler
    • Thread
    • earth longer loop meter model required
    • Replies: 18
    • Forum: The Welcome Forum
  20. R

    >2000 ohms on loop test?

    Hi guys, Was wondering if anyone could shed any light on why I would be getting >2000 ohms on my loop tests, on every circuit? I got .26 on the incoming reading, went to do the test on the cooker circuit and >2000, thought I'd try back at the consumer on the incoming and >2000 again, I'm using...

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